Blow-off valve.



J. ROTHGHILD.

BLOW-OFF VALVE. APPLICATION FILED my a, 1907.

91 ,490. Patented Apr. 6, 1909.

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mama wmy J. ROTHCHILD.

BLOW-OFF VALVE.

APPLICATION FILED MAY 3, 1907.

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J. ROTHOHILD. BLOW-OPP VALVE.

A PPPPP ATION FILED MAY 3, 1907.

917,490. Patented Apr. 6, 1909.

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JOSEPH ROTHOHILD, OF NEW YORK, N. Y., ASSIGNOR TO JOHN SIMMONS (10., OF NEW YORK,

N. Y., A CORPORATION. OF NEW YORK.

BLOW-OFF VALVE.

Specification of Letters Patent,

Application filed May 3, 1907'.

Patented April 6, 1909.

Serial No. 371,713.

To all whom it may concern:

Be it known that I, JosEPn Ro'rnoni n, a

citizen of the United States, residing at New York, in the county of New York and State 5 of New York, have invented certain new and use'l'ul Improvements in Blow-Oil Valves, of

which the following is a specification.

My invention relates to blow off valves for steam generators and is designed to be employed in the discharge. from such appliances ol' the solid ingredients deposited from the water used to generate steam -therein, using the current of fluid under pressure within the. generator for that purpose.

5 Owing to the rapid accumulation'of solid precipitates within a steam generator, the great pressures which exist therein and the increase of temperature which necessarily occurs when .the discharge of such materials takes place on account 01' some of the parts being brought into contact with the hot fluids, the valves employed to close the discharge ports should be as tight as possible, in order to prevent leakage, because if any leakage does occur the path alon which the heated lluid moves carrying wit 1 it'fine grit and precipitated material of great hardness is speedily destroyed under their erosive actionl Moreover, the workmen by whom such valves must necessarily be operated are 01' a. low grade of intelligence and it is best to leave them no opportunity for regulating the opening or closing of the valve or to do anything but move its handle or. operating stem. Another diiliculty met with invalves of this character is that of providing properly .l'or their adequate lubrication. It has been found difficult to introduce lubricants to the contacting parts and still more difficult to maintain at such points a suppl of proper lubricating material, because of t 1e heat and pressure. Y

In the valve which formsthe subject matter of this application, I believe I have solved some of the problems and overcome some-of the difficulties mentioned. In brief, I have provided a valve which is not only ti htl y.

closed when shut but one whichiis held 0 osed by the pressure of the fluid intended to be dischar ed upon the parts of the valve, one which, if'partly opened-, does not have its ultimate efficiency impaired by theerosive action of the materials assingtherethrough,

one whichcan be comp etely and thoroughly 'means, as the screws or bolts 14.

a column of fluid is passed t thetransverse channel 21.

lubricated and maintained lubricated and one the adjustment of which the operator cannot control alter its parts have been properly assembled.

In the drawings, Figure 1 is a plan of the assembled parts ol the valve; Fig. 2 is a central vertical section of the same on the plane of the line 2 -2 in Fig. 1.; Fig. 3 is a'transverse section on the plane 01' the line 3-3 in Fig.4; Fig. 4 is a central vertical section on the plane 01' the line 4--4 in Figs. 1 and 3; Fig. 5 is a perspective view 01' the discharge cylinder, encircling slide valve and its stem.

In the drawings, 10 is a valve casing provided with asuitablc inlet ort 11, and a suitable discharge port 12 am with a bonnet 13 secured to the casing by any suitable The upper end of the discharge port is expanded at 15 and internally threaded to receive the lower threaded end 16 of a discharge cylinder 17.

On each side of the casing there is pro.-

vided a pipe or conduit 18 turned inwardly at its bottom 19 and connecting at 1ts lower extremity to an upright channel or passage way 20 formed in each side of the cylinder 17. These channels or passage ways are, connected at" their upper extremities by a transverse channel 2].. recessedin the walls of the cylinder 17 and are preferably made partly or entu'ely open on their outer or circumferential side 22 opposite the encircling valve presently to be described in order thagrw'hen the valve is moved the contacting surfaces may roperly be lubricated. The pipes orchanne s 18 are provided with caps 180-t0 excludethe dust, or are extended,'as shown in dotted outline at 181, by means of a hose or pipe to a source of oil' supply'under pxressure whereby The discharge cylinder 17' is. rovided 'th longitudinal ports 23, 23, -w ich are placed preferably iametrically oposite to each 0t er and t is also rovide below 1; e level of these cylinder 17 and is preferably made in tWo pieces 31 and 32 identical in size and shape, each provideil with a air of projecting ears 33, 33,} each provides The channels 20 are rough them and with an annular flange 24 ports, but above the threaded end 16, and Wl'LlCh flange is adapted 'to afford a support for an encircling slide valve 30. This valve is arranged around the overlapping" flanges 34, 35, at their vertical ed es to form a joint and forming when assembled a cylinder with two ports, 36, 36, arranged diametrically opposite each other and adapted to register with the similar ports, 23, 23, of the cylinder 17. The slide valve rests upon the fiange 24 and when its parts are assembled and in place snugly encircles the cylinder 17, to its upper edge. it will be understood that by the rotation of the slide valve '30 with respect to the discharge cylinder 17, when the orts register, the discharge is open and-w en they cease to register the discharge is closed.

In order to rotate the slide valve 30, there is provided a centrally arranged valve stem 40 having downwardly extending forks 4'1, 41, which are adapted to project between and rest upon the cars, 33, 33. A small boss 37 is formed on the outer surface of the slide valve 30 and a corresponding depression engaging therewith is formed on the inner surface of each fork, 41, 41, facilitating their relative movement. The valve stem 40, when in position, is so arranged that there is preferably a s ace 42 between it and the u per surfaces 0 the cylinder 17 and-slide vaFve 30. The stem is adapted to pass through the bonnet 13 and the latter 1s provided with a hollow neck 43 restricted at 44 closely to embrace the stem 40, a shoulder 45 being turned on the upper side of the fork body and adapted to seat snugly against the lower surface 46 of the neck referred to. The stem 40 is squared at 47 to rovided a turning head. Within the nec 43 is a ring 50 of any suitable soft elastic filacking and arranged above this is a meta 'c rmg 51. Placed yet above this is a cap sleeve 53 adapted to enga e the turning head 47. A set screw 54 is a apted to pass through the cap 53 and into the stem 40, the pn ose of the construction being to adjust t e intermediate ring 51 against the packing ring 50 to vary the denslty and make a tight joint and to vary the location of the cap sleeve to adjust it with respect to the fixed part of the stem. This ring 50 may be lubricated in any approved manner. The method which I prefer is to drill a small channel through the cap 53 :down to the intermediate ring 51,

through which a liquid lubricant may be fed. Suita le stops 56, 56, are provided in the casing whereby over rotation of the valve stem 1s prevented-and accuracy of its operation is insured.

I It will be observed that when-the arts :have been assembled the movement 0 the valve in one direction is limited by the position of the fork of the stem with respect to the-ears onthe valve, and'its movement in the other direction is limited by the. position of the shoulder on the fork with respectto the seat on the casing, so that when once the valve is in position it is at to stay there. The annular flange on the discharge cylinder serves further to control this matter. The valve does not leak, the greater the pressure against the encircling segments of the valve, the tighter the valve is closed, and the greater the pressure against the forked stem ressing it against the shoulder in the casing t e more leakage is prevented at that point. At the same time the lubrication is perfect because oil can be poured into the conduits 18 and the fact that it has filled the parts designed to be lubricated is demonstrated by its discharge from the opposite conduit, showing that the con. duits and transverse Y passage way are full. If the valve is not used in such a position that the conduits are normally vertical or the action of gravity is insufficient to cause a proper circulation of the liquid lubricant, pressure may be a plied to one of the condults to induce a circu ation.

What I claim asnew is 1. A blow off valve comprising a discharge cylinder provided with suitable orts, a slide valve provided with ports and ar apted to encircle the cylinder and means for introducing a constant supply of lubricant to the contacting surfaces between the cylinder and the valve, consisting of two channels one on each side of the cylinder, each leading to the conta'cting surfaces and provided with a transverse connecting channel and connected to a suitable source of supply. A

2. A blow off valve comprising a discharge cylinder provided with suitable ports, an encircling valve adapted to be moved with relation thereto, automatic means for feeding a'constant supply of liquid lubricant to the surface between the cylinder and valve conconstant supply of liquid lubricant to the surface between the cyhnder and valve consisting of a suitable channel located within the walls of the cylinder and having openings leading to said surface and communications 7 through the exterior of the cylinder to a source of oil supply, whereby a, continuous column of lubricant is caused to remain in or flow through the channel.-

4. A blow off valve com a casing, a discharge cylinder plrovi ed "with suitable ports, an encircling s 'de valve adapted when rotated to close and open vsaid ports, and a stem projecting through the easin and adapted loosely to engage the slide an which stem is provided with a shoulder seating discharge cylinder provided with suitable.

ports, an encircling slide valve adapted when rotated to close and open said ports and which slide valve is .made' of independent.

parts with overlapping flanges, and. a stem projecting through the casing and adapted loosely to engage the parts of the slide to rotate them in unison, and which stem is provided with a shoulder seating against a portion of the casing whereby fluid pressure within the casing will press the stem'a ainst the casingand the slide against the cy inder to prevent leakage. Q

7. A blow off valve comprising a casing, a discharge cylinder rovided with suitable ports, an'encircling slide valve adapted when rotated to close and open said ports and which slide valve is made of independent segments, adapted togbe held in contact with the cylinder by the pressure of the passing fluid.

8. A blow off valve comprising a casing, a discharge cylinder provided with suitable ports, an encircling slide valve adapted when rotated to close and open said ports and which slide valve is made of independent segments provided with overlapping edges, adapted to be held in contact with the cylinder by'the pressure of the passing fluid.

9. A blow of valve comprising a casing, a discharge cylinder provided with suitable ports, a slide valve encircling the cylinder and provided with portsadapted when open to register with the ports of the discharge cylinder, ears on the side of the valve and an independent forked stem adapted to engage said ears to rotate the valve without producmg any longitudinal movement thereof;

10. A blow off valve comprising a casing, a

discharge cylinder provided with suitable ports, an encircling slide valve adapted when rotated to close and open said ports, means on the cylinder adapted to support the valve and limit its movement in one direction, and

means for rotating the valve which also limits its movement in the opposite direction.

v11-. A blow off valve comprising a casing within which is located a valve, a stem on said valve passing through the casing and provided with a turning head, a packing ring around the stem, a'cap sleeve fitted over said turning head, and means for adjusting itwith relation to the stem and at the same time controlling the'density of the packing ring.

12. A blow' off valvecompr'ising a casing within which is located a valve, a stem on said valve passing through the casing and provided witha turning head, a packing ring around the stem, a cap sleeve fitted over said turning head and outwardly shaped to serve also as a turning head, and a screw passing through the end of the cap sleeve into'the head of the-stem and adapted to adjust it with relation tothe stem.

13. A blow ofi valve comprising a casing within which is located a valve, a stem on said valve passing through the casing and' provided with a turning head, a packing ring around the stem, a cap sleeve fitted over said turning head and outwardl shaped to serve also as a turning head, an a screw passing through the end of the cap sleeve into the head'of the stem and adaptedto adjust it with relation to the stem and to control the vdensity of the packing ring. 14. A valve casing, a valve stem fitted In testimony whereof I afiiX my signature in presence of two witnesses. V g

, J OSEPH ROTHCHI] 1D. Witnesses WILLIAM R. BAIRD, ALAN MCDONNELL. 

